碳包覆合金/过氧化氢非均相Fenton体系高效矿化全氟辛酸

Outperformed PFOAs mineralization efficiency over carbon capsulated alloys/H_(2)O_(2) in the presence of heterogeneous Fenton system

全氟辛酸作为一种新型持久性有机污染物,广泛地应用于化工行业并造成大量的含氟废水.由于羟基自由基无法打破高强度C-F键,造成现有Fenton技术难以有效矿化全氟辛酸.该文通过制备碳包覆双金属催化剂,利用碳材料与金属界面应变效应,调控活性氧化自由基形态,以期实现非均相Fenton高效矿化全氟辛酸.研究结果表明,FeCo晶格畸变诱导电子转移至碳膜,导致H_(2)O_(2)活化为超氧自由基和过氧化氢自由基,从而使得全氟辛酸矿化率达到79.72%,远超现有非均相Fenton催化剂矿化效率.

Perfluorooctanoic acids(PFOAs),as a new kind of persistent organic pollutants,are widely spread in the communities of chemical industry,producing tremendous fluorine-containing wastewater.In the traditional Fenton technology,C-F bond with extreme strength is hard to be broken up via hydroxyl free radicals resulting in low mineralization efficiency of PFOAs.In this work,we successfully synthesized carbon capsulated bimetallic catalysts,utilized strain effects over the interface between carbon and bimetallic phase,then tuned reactive oxidative species,with the goal of exceptional mineralization efficiency of PFOAs via heterogeneous Fenton technology.The results suggested that the lattice distortion of FeCo phase promoted the charge transfer towards carbon shell,resulting in O_(2)^(-)·and HO_(2)^(-)formation.The pathways of H_(2)O_(2) activation gave rise to higher mineralization efficiency of PFOAs with 79.72%,outperforming that of catalysts in the existed Fenton technology,to date.